A concertgoer just stumbled onto a scenario she probably never imagined. Vivian, known as risubyday on Instagram, recently headed to the Ariana Grande concert at The O2 in London. However, when she got there, the seats she paid for were no longer available. Her experience immediately went viral, racking up over 1.6 million views in just one day as she documented a chaotic evening of being shuffled around the venue. In the caption of her post, V…